Example Unit Commitment.pdf

# Example Unit Commitment.pdf - UNIT COMMITMENT OF GENERATORS...

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UNIT COMMITMENT OF GENERATORS Example : The typical daily load and reserve requirements of a power system are as given in Table 1: Table 1 Hours 10 P.M.-10 A.M. 10 A.M.-6 P.M. 6 P.M.-10 P.M. Load, MW Reserve, MW 9 2 12 3 15 4 The system has 3 power plants with the capacity and cost figures as presented in the Table 2. Table 2 Plant Capacity Marginal Energy Cost,\$/MWh Fixed Losses \$/hr Start-up Cost \$ Shut-down Cost \$ A B C 10 10 5 50 100 150 30 20 10 100 150 80 20 10 5 The plants have constant incremental costs as represented by marginal energy cost figures given in Table 3. The minimum loads for the operating plants are 2 MW in the case of A and B and 1MW in the case of C. Assume that the start up costs are independent of whether the boilers are banked or not. Find the optimal periodic unit-commitment schedule and the corresponding short-run marginal costs. Assume merit order dispatching and ignore transmission/distribution losses.

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Solution The feasible combinations of plants to be committed at any period should have total capacity that is not less than the sum of load and reserve requirements.
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• Fall '06
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